Download and Open Thunderbird
From the menu, select Tools → Account Settings:\
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At the bottom left-corner, click on Account Actions → Add Mail Account:\
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Fill in your name, email address, and password. Then, click on Configure manually....\
For IMAP, Server is imap.ircnow.org, Port is 143, SSL is STARTTLS, Authentication is Normal password, Username is your username.\
For SMTP, Server is mail.ircnow.org, Port is 587, SSL is STARTTLS, Authentication is Normal password, Username is your username.\
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You can customize your new account. Once done, switch to the Inbox tab at the top-left corner.\
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Configuration is complete!\
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We encourage you to configure PGP for security.